Preparation and reactions of 1,1-zinc, boron and 1,1-copper, boron alkenyl bimetallics
作者:Jack R. Waas、AchyuthaRao Sidduri、Paul Knochel
DOI:10.1016/0040-4039(92)80007-7
日期:1992.6
Pinacol α-iodoalkenylboronates 8, readily prepared by the hydroboration of 1-iodoalkynes, were converted to 1,1-bimetallics of boron and zinc or copper which react with a wide range of electrophiles affording polyfunctional boronic esters. After H2O2 oxidation (30% H2O2, sat.aq. NaOAc), polyfunctional ketones were produced in good to excellent yields.
通过1-碘炔烃的硼氢化反应容易制得的频哪醇α-碘烯基硼酸酯8被转化为硼和锌或铜的1,1-双金属化合物,它们与各种各样的亲电试剂反应,得到多官能的硼酸酯。在H 2 O 2氧化(30%H 2 O 2,饱和NaOAc水溶液)之后,以良好或优异的产率制备了多官能酮。
ROMPgel-Supported Thiazolium Iodide: An Efficient Supported Organic Catalyst for Parallel Stetter Reactions
作者:Anthony G. M. Barrett、Andrew C. Love、Livio Tedeschi
DOI:10.1021/ol048694u
日期:2004.9.1
[reaction: see text] A high-loading ROMPgel-supported thiazolium iodide was prepared via ROMPolymerization of the corresponding norbornene-derived monomer. The resulting ionic ROMPgel proved to be an efficient organiccatalyst for Stetter reactions. The 1,4-dicarbonyl products, important intermediates in the synthesis of cyclopentenones and heterocycles, were obtained in high yields and excellent purities